Heat sink



FIG. 1 is a top plan view of a heat sink showing my new design;

FIG. 2 is a right side elevational view thereof; the left side elevational view being a mirror image of that shown;

FIG. 3 is a front elevational view thereof; the rear elevational view being a mirror thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view of a heat sink showing my new modified design;

FIG. 6 is a right side elevational view thereof, the left side elevation being a mirror image of that shown;

FIG. 7 is a front elevational view thereof, the rear elevational view being a mirror image of that shown; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for heat sink, as shown and described. 